How do I find the original cost of something if I know the percentage of markup and the final cost?

Becca wants to mix fruit juice and soda to make a punch. she can buy fruit juice for $3 a gallon and soda for $4 a gallon. if she wants to make 28 gallons of punch at a cost of $3.25 a gallon, how many gallons of fruit juice and how many gallons of soda should she buy?

Point x is located at (3,2). point y is located at (3,−8). what is the distance from point x to point y

Triangle pqr is similar to triangle xyz. what is perimeter of triangle xyz